Underworld Vs. Pink Floyd - Brown Acid (Hani & JP Mix) The Big Dark mash-up from 1997 was made famous by Jonathan Peters at the Sound Factory, nyc. JP suggested to me to work together on remixing "Comfortably NUMB" by Pink Floyd. We took his idea even further by Mashing it up with a big track at the time "Born Slipy" by Underworld. The Brown Acid name came from the sample used from the Woodstock Movie. Somehow it added another dimension to this mash-up. Thanks JP! It Was Fun doing this.